Most "highly compressed AetherSX2 game" collections on archive sites (Internet Archive) offer entire Redump sets already in CHD format. Look for packs labeled "PS2 CHD Collection" or "AetherSX2 Ready."
When searching online for "highly compressed AetherSX2 games," you will encounter thousands of websites promising 4 GB games compressed down to "50MB." Avoid the "50MB Game" Scam aethersx2 games highly compressed
CSO is a legacy compression format originally popularized by the PlayStation Portable (PSP) emulation scene. Games with heavy, uncompressed FMV (Full Motion Video)
Not all games compress equally. Games with heavy, uncompressed FMV (Full Motion Video) cutscenes compress poorly, while gameplay-driven titles compress incredibly well. Game Title Original ISO Size Compressed CHD Size Space Saved (%) ~42% Saved Dragon Ball Z: Budokai Tenkaichi 3 ~64% Saved God of War II 7.94 GB (Dual Layer) ~27% Saved Resident Evil 4 ~26% Saved Need for Speed: Most Wanted ~41% Saved Shadow of the Colossus ~50% Saved Step-by-Step: How to Compress Your Own PS2 ISOs to CHD Games with heavy
